/Engine/Source/Runtime/GeometryCore/Public/DynamicMesh/DynamicVertexAttribute.h
Update the overlay to reflect an edge merge in the parent
virtual void OnMergeEdges ( const [FDynamicMesh3::FMergeEdgesInfo](API\Runtime\GeometryCore\DynamicMesh\FDynamicMesh3\FMergeEdgesInfo) & MergeInfo )